KR101948770B1 - Expansion joint installation method and expansion joint structure using the same - Google Patents

Abstract

The present invention relates to an expansion joint structure formed at an expansion joint area compensating contraction and expansion of concrete due to change in temperature. More particularly, this invention comprises: elastic concrete constructed at an expansion joint area; a sealant constructed at an upper part of the elastic concrete; and a binding member fixated at a lower part concrete in order to increase binding force with the elastic concrete. Therefore, this invention is used to construct or repair an expansion joint area of a bridge or an underpass, and to repair an area where concrete has partially fell off. This invention provides rapid curing rate, superior usability, and elasticity which contributes to superior shock and wear resistance.

Description

TECHNICAL FIELD [0001] The present invention relates to a stretch joint method using a sealant and an elastic concrete, and an expansion joint structure using the same. [0002]

The present invention relates to a stretch joint structure formed at a stretch joint region that compensates for shrinkage and expansion of concrete due to a change in temperature, and more particularly, to a stretch joint structure formed of elastic concrete poured into a stretch joint portion, And a binding member fixed to the lower concrete to increase the coupling force with the elastic concrete. Thus, it is possible to provide a method for expanding or repairing a stretch joint part of a bridge or an underground driveway, Which is excellent in workability, has elasticity, and is excellent in impact resistance and abrasion resistance.

Concrete located under the running asphalt pavement of bridges or underground roads repeatedly shrinks and expands due to stress due to temperature change or vibration, resulting in cracks to the asphalt pavement surface, thus causing secondary damage.

To cope with such a problem, a telescopic device is installed at a predetermined distance in a bridge, an underground driveway, and the like. However, concrete expansion joints and other joints, including expansion joints, are easily damaged by external impacts. In addition, concrete applied to highways, runways, bridges, etc. has a problem of breakage due to partial dropping due to various external factors. Considering the fact that traffic should be opened within a short period of time in order to repair the damaged part in the concrete joint part or partial dropout, mortar, concrete, epoxy resin, methyl methacrylate (MMA) resin is used as the mortar.

However, when mortar, concrete, or mortar with epoxy resin or methyl methacrylate (MMA) resin is used to fasten a stretching device or repair joints using ultra fast cement, the load due to the vehicle Or easily broken again due to vibrations or shocks. Especially, in the concrete or epoxy mortar using the existing asphalt and the modified quick cement close to the connection site, the material used for the repair has excellent strength but not elasticity, and the thermal expansion coefficient is different from that of the asphalt, The asphalt with weak brittleness is broken first. If the asphalt is broken, the water will be impregnated between the broken asphalt and the lower concrete layer, and the weak asphalt will continuously be separated and fall off.

In order to solve such a problem, there has been a demand for development of an elastic mortar used for fixing a stretching device or for repairing concrete.

Such prior art is disclosed in Japanese Patent Registration No. 10-1355399 entitled " Construction of a joint structure for underground roadway and bridge structure,

In the above-described prior art,

A first pore pipe inserted in a spaced gap between concrete structures, a second pore pipe inserted into a concrete cut portion formed by cutting a concrete structure to a predetermined depth below the vertical wall of the cut portion of the road pavement, A cover covering the open upper portion of the concrete cut portion, and an elastic joint material mixed with an aggregate and a thermoplastic resin in a road package cut portion, and a finish material is applied on the upper part of the elastic joint material. A first flame retardant fiber member attached over the bottom surface of the cut portion and the entire vertical walls on both sides; The concrete cut portion to which the second pipe is inserted is formed on the lower side of the vertical wall on both sides of the cut portion of the road covering material, One technology is presented.

However, the above-mentioned prior art has been able to flexibly cope with shrinkage and expansion by simply using a fiber member attached over the vertical wall. However, due to frequent shrinkage and expansion, Or cracking problems may occur.

Also, in the prior art, Registration No. 10-1476692 entitled " No-joint expansion joint structure using underground roadway and brick waterproofing "

The prior art is spaced apart at predetermined intervals,

A concrete slab in which an underground effluent drain pipe is inserted and installed at the interval; A primer layer formed on top of the concrete slab; A coating film waterproof layer formed on the top of the primer layer and on the entire upper portion of the underground effluent water pipe; A lattice-like grid provided on the top of the waterproof film layer; And an asphalt pavement layer disposed on the upper portion of the grid. On the upper surface of the concrete slab, drain pipe insertion grooves having a slope of 20 to 50 degrees with respect to the longitudinal direction of the road are formed at regular intervals, The penetration water drain pipe is inserted into the groove, and the technique is presented.

However, the above-mentioned prior art is to prevent the deformation due to shrinkage and expansion from being transmitted to the package layer through the grid, and there is a limit in preventing the transmission of the deformation amount of shrinkage and expansion with the slab in which the drain pipe is inserted merely. The shrinkage and expansion due to the irradiation amount can not be prevented and cracks may occur.

Furthermore, as another prior art, there is a registered patent No. 10-1512966 entitled " Elastic Mortar Composition and Construction Method Using the Same &

Based on 100 parts by weight of the elastic mixture, 80 to 100 parts by weight of a cured mixture; 0.1 to 3 parts by weight of lead compound; 1 to 5 parts by weight of carbon black; 0.05 to 3 parts by weight of an antifoaming agent; 30 to 1,000 parts by weight of aggregate; 10 to 30 parts by weight of a filler; 1 to 10 parts by weight of an anti-segregation agent; 0.5 to 5 parts by weight of a plasticizer; 0.1 to 5 parts by weight of a fluidizing agent; And 3 to 8 parts by weight of a ceramic binder, and a construction method using the same.

In addition, there is a prior art 10-655227 " polyurethane resin mortar and its construction method "

The above prior art is characterized in that (A) 10 to 20 parts by weight of a mixture of isocyanate, polyol and additives, (B) 5 to 15 parts by weight of a filler and (C) 65 to 85 parts by weight of an aggregate , Which has an elastic recovery performance of 70% or more as measured by a method according to ASTM D 695 under a load of 5%.

However, the above-mentioned prior arts not only fail to satisfactorily satisfy all the properties required for the maintenance mortar composition but also use a synthetic polyol such as a polyether polyol or a polyester polyol alone or a synthetic mixed polyol, Lt; / RTI > Recently, attention has been paid to various measures for reducing environmental pollution and reducing energy consumption and carbon dioxide generation in the industrial field in general. In particular, a repair mortar composition used for various roads, bridges, civil engineering structures, etc., It is important to increase environmental friendliness in the environment.

Therefore, there is still a demand for development of elastic concrete capable of sufficiently securing various characteristics required for repairing civil engineering structures and at the same time, enhancing environmental friendliness.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

It is used for repairing part of joint part or concrete part which is installed at a certain size at regular intervals in bridges, underground roads, roads, etc., and absorbs repeated shrinkage, expansion, compression and tension due to temperature change, And to provide a stretch joint structure using a sealant and an elastic concrete excellent in fastness, workability, elasticity, abrasion resistance and durability and excellent in impact resistance.

In order to accomplish the above object, the present invention provides a stretch joint structure using a sealant and an elastic concrete according to the present invention,

Elastic concrete placed at the expansion joint;

A sealant disposed on the elastic concrete;

And a binding member fixed to the lower concrete to increase the binding force with the elastic concrete,

The elastic concrete

Comprising 18 to 22% by weight of an elastic urethane resin and 78 to 82% by weight of a filler, the filler comprising a base comprising a natural polyol and a curing agent,

Wherein the natural polyol comprises 29 to 35% by weight of castor oil, 16 to 19% by weight of soybean oil, 9 to 12% by weight of coconut acid, 9 to 11% by weight of gum rosin, 25 to 27% by weight of C12-14 alkyl glycidyl ether, By weight and 1.5 to 3.0% by weight.

As described above, the stretch joint structure using the sealant and the elastic concrete according to the present invention

It is easy to fill in a small and narrow space due to its excellent fluidity. It is excellent in workability and can be applied to fixation and repair of connecting device of a stretch joint part, repair of part of a concrete part of a concrete structure, Is possible.

Further, since the bonding force of the elastic concrete is further improved through the bonding member, it is possible to prevent the elastic concrete from being separated by the impact, and furthermore, the pipe can absorb and discharge the ground water to the bonding member. It is possible to prevent cracks from occurring due to groundwater.

Also, the elastic concrete used in the present invention has excellent elasticity, absorbs repeated shrinkage, expansion, compression, and tensile due to temperature change, can increase the responsiveness to vibration and live load,

It has high abrasion resistance and excellent durability that does not cause interface delamination, so it can be applied to civil structures such as concrete structures with stretching joints, which can effectively complement the physical properties of the civil structure and prolong its service life.

1 is a block diagram of a telescopic joint method according to the present invention;
2 is a perspective view of a first embodiment of a stretch joint structure according to the present invention
3 is a cross-sectional view of a second embodiment of the expansion joint structure according to the present invention
Figs. 4 and 5 are cross-sectional views showing problems of a conventional expansion joint structure
FIG. 6A is a photograph showing the deformation of a portion subjected to a load in the compression strength and deformation recovery test of the elastic concrete used in the present invention
6B is a photograph showing a state in which the deformation is restored after removing the load
7A is a photograph showing the mold used in the fluidity test for the elastic concrete used in the present invention
FIG. 7B is a photograph showing a shape in which the elastic concrete injected into the mold spreads horizontally to increase the diameter when the mold is lifted upward; FIG.
Fig. 8 is a graph showing compressive strength and strain recovery test results of the elastic concrete used in the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a block diagram of a telescopic joint method according to the present invention,

first,

1. Step of cutting a concrete (ascon) surface around a stretch joint using a cutter (a)

2. Process of crushing the cutting site using a crusher, removing the crushed foreign material and cleaning it to form a stretch joint (b)

(C) a step of installing a mold so that the elastic concrete does not flow down at the end of the expansion joint part (c)

4. The process of applying the adhesion enhancer to the concrete surface cut at the stretch joint (d)

5. A step of fixing the below-described binding member to the lower concrete (e)

In this case, the application of the adhesion enhancer is performed by applying water after drying so that the water content is less than 8% because water is used when cutting the cut surface, or when the concrete is functioning, a water-soluble adhesion enhancer Is applied. The use amount of the adhesion enhancer may preferably be about 0.2 to 0.4 kg / m 2.

6. The process of kneading the elastic concrete when the surface of the applied adhesion enhancer is touched by hand and pouring it into the mold (f)

7. After curing of the poured elastic concrete, the mold is removed and the sealant is applied to the upper surface. (G)

.

At this time, the step (e) of installing the binding member may be performed before the mold is installed, and the scope of the right should not be limited.

In addition, the present invention is characterized in that it is formed in a stretch joint region using the elastic concrete. More specifically,

As shown in FIGS. 2 and 3, the elastic joint 10 employing the sealant 20 and the elastic concrete 10 according to the present invention is constructed such that the elastic concrete 10 placed on the expansion joint A1, A sealant 20 placed on the upper concrete 10 and a binding member 30 fixed to the lower concrete UC and positioned within the elastic concrete 10 to increase the bonding force of the elastic concrete.

FIGS. 4 and 5 illustrate a conventional expansion joint structure A. Before describing the present invention, the problems of the conventional expansion and contraction structure will be described with reference to the drawings.

As shown in Fig. 4A, conventionally, an elastic concrete 10 having a high elastic force is laid at a stretch joint portion, and a sound absorbing material 11 is inserted at the center of the stretch joint portion A1 to prepare for shrinkage and expansion Respectively.

However, in this case, as shown in FIG. 4B, there is a problem that a weak portion such as a crack is generated due to a decrease in strength due to frequent contraction and expansion of the ascon, which is in contact with the elastic concrete 10.

5A, a mixed paint of an ascon and a sealant 20 is applied to the stretch joint portion A1, and then a sealant 20 is applied on the stretch joint portion A1. However, The shrinkage and expansion are not absorbed by the mixed paint and are transferred to the sealant 20. The sealant 20 is shaved by the impact as shown in Fig. 5 [B], and cracks are generated.

Accordingly, in order to solve the problems of the related art as described above, the present invention has been made to solve the above-mentioned problems of the prior art by using the elastic concrete 10 to cope with shrinkage and expansion and to provide a separate fixing member 30 for firm fixing. .

First, the binding member 30 of the present invention will be described in more detail with reference to the following two embodiments,

First, the elastic concrete 10 of the present invention may contain 18 to 22% by weight of an elastic urethane resin and 78 to 82% by weight of a filler, which contains a subject containing a natural polyol and a curing agent, 29 to 35 wt.%, Soybean oil 16 to 19 wt.%, Coconut acid 9 to 12 wt.%, Gum rosin 9 to 11 wt.%, C12-14 alkyl glycidyl ether 25 to 27 wt. / RTI >

The elastic urethane resin contained in the natural polyol elastomeric concrete 10 serves as a binder in the natural polyol elastomeric concrete 10.

The content of the elastic urethane resin may be 18 to 22% by weight based on the total weight of the natural polyol elastomeric concrete (10). When the content of the elastic urethane resin is less than 18% by weight, the fluidity is lowered, the workability is lowered, the elastic restoring force is lowered and the strength is not secured sufficiently. When the content exceeds 22% by weight, the fluidity is excessively increased, And when the load is applied in the cured state, the degree of deformation becomes large.

The elastomeric urethane resin may comprise a base and a curing agent comprising a natural polyol.

The natural polyol used in this embodiment is a bio-polyol produced from a natural material as a raw material, and is an environment-friendly binder capable of reducing the generation of greenhouse gases as compared with the use of a synthetic polyol. Examples of the natural material constituting the natural polyol include a vegetable natural resin, and the natural resin is composed of triglyceride having three fatty acids bonded to one molecule of glycerol. The natural polyol has a difference in viscosity depending on the molecular weight and the average hydroxyl group content. That is, a polyol having a high molecular weight and a hydroxyl group content has a higher viscosity.

In the present embodiment, the natural polyol can be formed using castor oil having a hydroxyl group and soybean oil having no hydroxyl group as main ingredients.

Ninety percent of the fatty acids that make up castor oil are ricinoleic acid with C12 and a carbon-carbon double bond hydroxyl group. Since castor oil has a hydroxyl group, it can be used directly as a natural polyol. In addition, it can be used as a natural polyol by additionally bonding more hydroxyl groups.

Soybean oil has a carbon-carbon double bond such as castor oil, but does not have a hydroxyl group. Thus, vegetable resins, including soybean oil, must bind hydroxyl groups to be used as natural polyols.

For example, it is possible to bond a hydroxyl group to a fatty acid carbon chain by various methods for castor oil and soybean oil, for example, by oxidizing a carbon-carbon double bond, epoxidizing it, and then converting it into a natural polyol And more of the hydroxyl groups can be bonded to the alkyl glycidyl ether.

In one embodiment, the natural polyol comprises 29 to 35% by weight of castor oil, 16 to 19% by weight of soybean oil, 9 to 12% by weight of coconut acid, 9 to 11% by weight of gum rosin, By weight and 1.5 to 3.0% by weight of hydrogen peroxide, by mixing and kneading these materials.

In the above examples, the constituent components and the content of the polyol used in the preparation of the natural polyol are set in consideration of maximizing physical properties and effects of the polyol.

Specific methods that can be used for the production of the natural polyol are well known in the art, and can be prepared by selecting an appropriate method among known methods considering the processing conditions and environment.

The material formed using the natural polyol thus formed has a lower reactivity than the material formed using the synthetic polyol, but is characterized by excellent thermal stability and oxidation resistance. This is because the natural polyol has a higher hydrocarbon content than the petroleum-based synthetic polyol. That is, the natural polyol has a high molecular weight because it has a high hydrocarbon content, and when the molecular weight is large, the molecular stability can be increased.

The natural polyol may be included in an amount of from 60 to 65% by weight, based on the total weight of the subject matter. When the content of the natural polyol is less than 60% by weight, the content of the natural polyol as a main component is small, resulting in deterioration of properties such as elasticity and strength. When the content of the natural polyol is more than 65% by weight, And flow occurs during construction.

In one embodiment, the subject comprising the natural polyol may further comprise one or more selected from the group consisting of a plasticizer, a crosslinking agent, a curing accelerator, a water absorbent and a colorant.

The plasticizer can increase the flexibility of the natural polyol elastomeric concrete 10 and improve the mechanical properties.

The plasticizer that can be used in this embodiment may include at least one selected from the group consisting of dioctyl phthalate (DOP), dioctyl adipate (DOA), and tricresyl phosphate (TCP).

The plasticizer content may be from 13 to 15% by weight, based on the total weight of the subject, including natural polyols. If the content of the plasticizer is less than 13% by weight, the effect of improving the plasticity and mechanical properties of the elastic urethane resin may not be sufficient. If the content of the plasticizer exceeds 15% by weight, the properties of the elastic urethane resin may be deteriorated.

The crosslinking agent improves the mechanical strength of the natural polyol elastomeric concrete 10 by improving crosslinking.

The crosslinking agent that can be used in this embodiment may include an aziridine crosslinking agent.

The content of the crosslinking agent may be from 13 to 15% by weight, based on the total weight of the subject, including the natural polyol. When the content of the crosslinking agent is less than 13% by weight, the viscosity of the elastic urethane resin is lowered and the curing or curing is delayed and the strength is lowered. When the content of the crosslinking agent is more than 15% by weight, the viscosity of the elastic urethane resin is excessively increased, The curing and curing speed is accelerated, and the workability is lowered.

The curing accelerator can further accelerate curing of the natural polyol elastomeric concrete (10).

The curing accelerator that can be used in the present embodiment can be appropriately selected from curing accelerators known in the art which can accelerate the curing of the elastic concrete 10.

The content of the curing accelerator may be from 2 to 5% by weight, based on the total weight of the subject, including the natural polyol. If the content of the curing accelerator is less than 2% by weight, the curing speed of the elastic concrete 10 may be somewhat delayed and the vehicle traveling time may be delayed. If the content is more than 5% by weight, the curing speed of the elastic concrete 10 is accelerated The workability may be deteriorated.

The water absorbent can absorb and remove moisture in the natural polyol elastic concrete (10).

The water absorbent that can be used in the present embodiment can be appropriately selected from water absorbents known in the art capable of absorbing and removing moisture of the elastic concrete 10 and used.

The content of the water absorbent may be 1.0 to 2.0% by weight, based on the total weight of the subjects, including the natural polyol. When the content of the water absorbent is less than 1.0 wt%, moisture remains in the material and expands, making it difficult to suitably match the volume and strength, and when it exceeds 2.0 wt%, the production cost increases.

The colorant can impart a desired color to the natural polyol elastomeric concrete (10).

The colorant that can be used in this embodiment may include carbon black.

The content of the colorant may be from 3.0 to 5.0% by weight, based on the total weight of the subject, including the natural polyol. Although the content of the colorant does not directly affect the physical properties of the elastic concrete 10, when the content of the colorant is out of the range, the color differs from the existing asphalt.

The curing agent for curing the subject using the natural polyol may include an isocyanate curing agent. The isocyanate curing agent is selected from the group consisting of toluene diisocyanate (TDI), methyl diphenyl diisocyanate (MDI), naphthalene diisocyanate (NDI), toluidine diisocyanate (TOD), hexamethylene diisocyanate (HDI), xylene diisocyanate And combinations thereof, preferably TDI or MDI. Specific examples may include methylene diphenyl diisocyanate.

Based on the total weight of the elastic urethane resin, the subject containing natural polyol may be contained in an amount of 65 to 75% by weight, and the curing agent may be contained in an amount of 25 to 35% by weight.

When the content of the natural polyol-containing subject is less than 65% by weight and the content of the hardening agent exceeds 35% by weight, the curing rate is somewhat faster and the strength of the elastic concrete 10 is lowered. The content of the curing agent is less than 25% by weight, the curing is delayed, and the strength is lowered due to the unreacted matters existing in the elastic concrete 10.

The filler contained in the natural polyol elastomeric concrete (10) can serve as an aggregate to be combined with the elastic urethane resin as a binder.

The filler used in this embodiment may include at least one selected from the group consisting of dolomite, glass beads, feldspar, slaked lime and synthetic zeolite.

In one embodiment, the filler comprises, based on the total weight of the filler, 40-47 wt% dolomite, 35-40 wt% glass beads, 10-15 wt% feldspar, 4-6 wt% 2% by weight of synthetic zeolite.

The natural polyol elastic concrete 10 according to the present embodiment can maintain and optimize the elastic restoring force, fluidity and workability of the elastic urethane resin using the natural polyol by using the filling material having such a specific constitution, .

For example, dolomite and glass beads have a lower absorption ratio than other inorganic aggregates and are effective in securing appropriate fluidity and workability.

The natural polyol elastomeric concrete 10 according to an embodiment of the present invention is excellent in fluidity and can be uniformly filled in a stretched joint portion to be applied, and is excellent in adhesiveness to concrete and asphalt, impact resistance, abrasion resistance Since it is fast-moving, the traffic opening can be accomplished within a short time, and since it has excellent elastic recovery performance and strength, it is possible to reduce the occurrence of damage due to temperature change or vibration.

In one embodiment, the natural polyol elastomeric concrete 10 may have a strain recovery of at least 70%.

The natural polyol elastomeric concrete 10 according to an embodiment of the present invention can be effectively applied to fix a connecting device installed in a bridge or an underground driveway, or to repair a partially separated portion of an expansion joint or a concrete structure.

[Example]

1. Manufacture of elastic urethane resin

(1) Production of natural polyol-containing subject

The ingredients containing the natural polyols prepared in (1) above were prepared by mixing the respective components according to the content ratios shown in Table 1 below.

[Table 1]

The respective components used in the above Table 1 are as follows.

Natural polyol consisting of 34.6% by weight of castor oil, 17.7% by weight of soybean oil, 10.1% by weight of coconut acid, 9.1% by weight of gum rosin, 27% by weight of C12-14 alkyl glycidyl ether and 1.5% by weight of hydrogen peroxide By order Source: Imported from SEA Chemical)

- Plasticizer: Dioctyl phthalate (DOP) (supplied by Daejin Chemical Co., Ltd.)

- Crosslinker: Crosslinker CL-427 (Manufactured by Menadiona)

- Curing accelerator: Conacure AH-40 (supplied by CYTEC), Baytec 1604 (supplied by Beyond Industries Limited)

- Water absorbent: ZOLDIN MS-PLUS (supplied by ANGUS Chemical)

- Colorant: Carbon black (supplier pigment)

(2) Production of elastic urethane resin

An elastic urethane resin was prepared by mixing 68.4% by weight of the natural polyol-containing subject prepared in (1) above and 31.6% by weight of a curing agent. As the hardener, methylene diphenyl diisocyanate (MDI: manufactured by BASF) was used.

2. Manufacture of Filling Materials

The fillers were prepared by mixing the respective components according to the content ratios shown in Table 2 below.

[Table 2]

Each component used in Table 2 is as follows.

- Baekunsa: # 4 company, # 5 company (source: Jinseong material)

- Glass bead: 1.2 mm or less in diameter (BINEX Co., Ltd.)

- Feldspar: # 200 mesh (supplied by Joe Eun)

- Thin lime: Thin lime grade 1 (supplier: Chungmoo Chemical)

- Synthetic zeolite: JST-MSP (available from Jisim Tech Co., Ltd.)

3. Manufacture of Natural Polyol Elastic Concrete (10)

The natural polyol elastomeric concrete (10) according to Examples and Comparative Examples of the present invention was prepared by mixing the elastic urethane resin prepared in 1 above and the filler prepared in 2 above according to the content ratios shown in Table 3 below.

[Table 3]

4. Physical properties test for natural polyol elastomeric concrete (10)

The following tests were conducted to evaluate the physical properties of the natural polyol-organic hybrid composite concrete (10) prepared in Examples 1 to 3 and Comparative Examples 1 and 2 prepared above.

(1) Test method

1) Compressive strength

The specimens were prepared from the natural polyol-organic hybrid composite concrete (10) of Examples 1 to 3 and Comparative Examples 1 and 2 by using 4 cm, 4 cm and 16 cm molds, cured at 23 ° C, And on the third day, the compressive strength was measured by KSF 4042 (polymer mortar for repairing concrete structures).

2) Deformation recovery

A specimen was prepared from the natural polyol-organic hybrid composite concrete (10) of Examples 1 to 3 and Comparative Examples 1 and 2 by using a 4 cm, 4 cm and 16 cm mold, cured at 23 ° C, The load was removed at KSF 4042 (polymer mortar for repairing concrete structure) at the point where there was no change in the load value for measuring the compressive strength, and the deformation height of the specimen after the deformation was stabilized was measured. Deformation recovery was obtained according to the following equation. In the following equation, the height of the initial specimen is 4 cm.

[Mathematical Expression]

3) Liquidity

On the flat glass plate, the natural polyol organic-inorganic hybrid composite concrete 10 of Examples 1 to 3 and Comparative Examples 1 and 2 was filled in a circular mold having a diameter of 30 mm and a height of 50 mm as shown in Fig. 2A, After removal, the elastic concrete 10 was naturally spread, and the width of the spread type was measured.

4) Separation of aggregate

After the completion of the compressive strength measurement and the deformation recovery test, the sample was cut in the transverse direction, and the separation property between the paste and the aggregate was visually observed.

5) Coagulation time

 The coagulation test was carried out in accordance with KSL 5207. In the molds having an upper diameter of 75 mm 3 mm, a lower diameter of 85 mm 3 mm and a height of 40 mm 0.5 mm, the natural polyol organic / inorganic composite of Examples 1 to 3 and Comparative Examples 1 and 2 After the elastic concrete 10 was injected, the final needles were dropped. The time for which no traces were left on the surface without being inserted into the interior of the elastic concrete (10) even after the drop was dropped was determined as the setting time.

(2) Test results

Test results are shown in Table 4 and Figs. 6 to 8, respectively.

[Table 4]

FIG. 6A is a photograph showing deformation occurring in a region subjected to a load in the compressive strength and deformation recovery test. FIG. Then, when the load was removed, the natural polyol-organic-inorganic hybrid composite concrete 10 of Examples 1 to 3 was restored by the elastic force, and FIG. 6B shows a state in which the deformation was restored in the circular display line. On the other hand, in the case of Comparative Examples 1 and 2, the portion subjected to the load was not recovered after the deformation and was broken.

Fig. 7A shows a circular mold having a diameter of 30 mm and a height of 50 mm used for fluidity measurement. Fig. 7B shows that when the mold is lifted up, the elastic concrete 10 having a diameter of 30 mm injected into the mold spreads horizontally And the diameter increases. In Examples 1 to 3, the diameter greatly increased to 80 mm or more, whereas in Comparative Example 1, the increase in fluidity was not greater than in Examples 1 to 3, and in Comparative Example 2, the fluidity was excessively increased, .

Fig. 8 is a photograph of the sample after completion of the compression strength measurement and deformation recovery test in the cross-sectional direction, and observing the separation property between the paste and the aggregate. In Examples 1 to 3, it can be seen that the aggregates are uniformly distributed without being separated.

The present invention further comprises a binding member (30), so that the binding force of the elastic concrete (10) can be further improved.

The binding member 30 may be composed of two embodiments, and each of the embodiments will be described in more detail.

2, the binding member 30 includes an anchor member 31 coupled to the lower concrete UC, and an anchor member 31 coupled to the anchor member 31, And a fixing plate (32) located in the concrete (10).

More specifically, the anchor members 31 are provided on both sides of the center AM, which are separated from the center AM by a predetermined distance from the center AM of the expansion joint A1. So as to be positioned within the elastic concrete (10).

The anchor member 31 is provided with a fixing plate 32. The fixing plate 32 is formed in a rectangular plate shape and has a coupling hole 325 through which the anchor member 31 can be coupled, The fixing plate 32 is located in the elastic concrete 10 so as to be fixed at a position spaced apart from the lower concrete UC.

Further, the fixing plate 32 may be formed with a plurality of through holes 324 to further improve the binding force with the elastic concrete 10.

It is further preferable that a sound absorbing material 11 is further provided at the center AM of the expansion joint A1 to a height at which the elastic concrete 10 is poured from the lower concrete UC.

In addition, the construction of the above-described structure is performed by inserting the sound-absorbing material 11, fixing the binding member 30 to the lower concrete UC, inserting the elastic concrete 10 and the sealant 20 in order . ≪ / RTI >

3 shows a second embodiment of the binding member 30. The fixing plate 32 includes a tight contact portion 321 closely contacting the upper surface of the lower concrete UC, And the bent plate 322 is formed to form the spacing portions 323 on both sides of the center axis AM of the stretch joint portion A1 so as to be opposed to each other, , And the separation part (323) is provided with a spiral pipe (34).

More specifically, the fixing plate 32 is provided on both sides in a shape spaced apart from the center AM of the stretch joint A1. Unlike the fixing plate 32 of the first embodiment, UC and is formed of a bent portion 322 which is bent upward from the close contact portion 321,

The fixing plates 32 are provided on both sides of the center AM of the stretch joint A1 so that the bent portions 322 of the pair of fixing plates 32 are spaced apart from each other, So that the spacing portion 323 can be formed between the two spacers 322.

The anchor member 31 is fixed to the lower concrete UC provided on the tightening portion 321 and is capable of fixing the fixing plate 32 to the upper surface of the lower concrete UC.

The sound absorbing material 11 is provided at the center AM of the expansion joint A1 similar to the first embodiment and is located above the oil pipe 34 to be described later and is located at the center of the expansion joint A1 AM, the upper surface of the sound absorbing material 11 may be located on the same line as the upper surface of the elastic concrete 10.

In addition, the second embodiment of the present invention can further prevent the generation of cracks due to the inflow of the groundwater,

The perforated pipe (34) is provided in the spacing part (323) and is formed of a helical cylindrical pipe.

That is, the pipe (34) is formed such that a pipe having a spiral shape similar to a spring forms one pipe. Ground water rising along the gap is formed inside the pipe (34) through the gap It can be discharged in one direction along the perforated pipe 34 so that the groundwater can be prevented from penetrating into the sealant 20 placed on the upper part, thereby preventing cracks from being generated.

Furthermore, the fixing plate 32 may further include a plurality of through holes 324 to improve the binding force.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the above embodiments, but various alterations, modifications and substitutions can be made by those skilled in the art Such modifications, alterations, and substitutions are to be construed as being within the scope of the present invention.

A: Expansion joint structure UC: Lower concrete
A1: stretch joint AM: center of joint
10: elastic concrete 11: sound absorbing material
20: sealant 30: binding member
31: anchor member 32: fixed plate
325: Coupling ball
321: tight contact portion 322:
323: separation part 324: through hole
34:

Claims (4)

A step of cutting the surface around the stretch joint portion (A1);
Crushing the cut portion to form the stretch joint portion (A1);
A step of installing a mold in the stretch joint portion A1;
Removing foreign matter or moisture from the stretch joint portion (A1) and applying an adhesion enhancer to the cut surface;
Providing a binding member (30) to the stretch joint portion (A1);
Placing the elastic concrete (10) on the stretch joint portion (A1); And
Applying a sealant (20) on the elastic concrete (10);
, ≪ / RTI >

The fastening member 30 provided at the stretch joint portion A1
An anchor member 31 coupled to the lower concrete UC and a fixing plate 32 coupled to the anchor member 31 and positioned in the elastic concrete 10,
A plurality of through holes 324 are formed in the fixing plate 32,
A sound absorbing material (11) is further provided at a center (AM) of the expansion joint (A1)
The fixing plate (32) of the binding member (30)
A tight contact portion 321 which is in close contact with the upper surface of the lower concrete UC and a bent portion 322 which is bent upward from the close contact portion 321,
The fixing plate 32 is provided on both sides of the center of the stretch joint portion A1 to form a spacing portion 323 facing each other,
The spacing portion 323 is further provided with a spiral pipe tube 34,
The sound absorbing material 11 is located on the upper side of the pipe tube 34 so that its upper surface is located on the same line as the upper surface of the elastic concrete 10,
The elastic concrete (10)
18-22% by weight of an elastomeric urethane resin, comprising a subject comprising a natural polyol, and a curing agent; and
78 to 82% by weight filler material,
Wherein the natural polyol comprises 29 to 35% by weight of castor oil, 16 to 19% by weight of soybean oil, 9 to 12% by weight of coconut acid, 9 to 11% by weight of gum rosin, 25 to 27% by weight of C12-14 alkyl glycidyl ether, 1.5 to 3.0% by weight,
Wherein the filler is selected from the group consisting of 40 to 47 wt.% Dolomite, 35 to 40 wt.% Glass beads, 10 to 15 wt.% Feldspar, 4 to 6 wt.% Slaked lime and 1 to 2 wt. Zeolite. ≪ RTI ID = 0.0 > 11. < / RTI > delete Elastic concrete (10) poured into the expansion joint (A1);
A sealant 20 placed on the elastic concrete 10;
And a binding member (30) fixed to the lower concrete (UC) and positioned within the elastic concrete (10) to increase the binding force of the elastic concrete (10)
The binding member (30)
An anchor member 31 coupled to the lower concrete UC and a fixing plate 32 coupled to the anchor member 31 and positioned in the elastic concrete 10,
A plurality of through holes 324 are formed in the fixing plate 32,
A sound absorbing material (11) is further provided at a center (AM) of the expansion joint (A1)
The fixing plate (32) of the binding member (30)
A tight contact portion 321 which is in close contact with the upper surface of the lower concrete UC and a bent portion 322 which is bent upward from the close contact portion 321,
The fixing plate 32 is provided on both sides of the center of the stretch joint portion A1 to form a spacing portion 323 facing each other,
The spacing portion 323 is further provided with a spiral pipe tube 34,
The sound absorbing material 11 is located on the upper side of the pipe tube 34 so that its upper surface is located on the same line as the upper surface of the elastic concrete 10,
The elastic concrete (10)
18-22% by weight of an elastomeric urethane resin, comprising a subject comprising a natural polyol, and a curing agent; and
78 to 82% by weight filler material,
Wherein the natural polyol comprises 29 to 35% by weight of castor oil, 16 to 19% by weight of soybean oil, 9 to 12% by weight of coconut acid, 9 to 11% by weight of gum rosin, 25 to 27% by weight of C12-14 alkyl glycidyl ether, 1.5 to 3.0% by weight,
Wherein the filler is selected from the group consisting of 40 to 47 wt.% Dolomite, 35 to 40 wt.% Glass beads, 10 to 15 wt.% Feldspar, 4 to 6 wt.% Slaked lime and 1 to 2 wt. And a synthetic zeolite. The elastic joint structure using the sealant and the elastic concrete. delete

Images